Shaft Crack Analysis and Diagnosis for the 600MW Steam Turbine Generator


Article Preview

In order to find the cause of the shaft crack appeared in a 600MW steam turbine generator, several measurements are taken. The shaft assembly consists of three parts: shrink-fitted coupling, shaft and key which are used to transfer torque between coupling and shaft. First, the natural frequency of the shaft system is calculated. The result shows that the vibration signal contains the frequency nears the second natural frequency of the steam turbine shaft system. Second, stress field near the damaged coupling and shaft is analyzed using finite element method. The torque under different operation condition is calculated before stress analysis and applied to the shaft assembly, then. And, local stress concentrations position calculated is proved to be coincident with the place crack initiation. Finally, the cause of the fault is analyzed: at least three causes have found to be having something to do with the crack fault.



Key Engineering Materials (Volumes 413-414)

Edited by:

F. Chu, H. Ouyang, V. Silberschmidt, L. Garibaldi, C.Surace, W.M. Ostachowicz and D. Jiang




D. X. Jiang et al., "Shaft Crack Analysis and Diagnosis for the 600MW Steam Turbine Generator", Key Engineering Materials, Vols. 413-414, pp. 591-598, 2009

Online since:

June 2009




[1] C. Chyn, R. -C. Wu, T. -P. Tsao.: Generation, Transmission and Distribution, IEE Proceedings, Vol. 143(1996).

[2] IEEE Subsynchronous Resonance Working Group, Proposed Terms and Definitions for Subsynchronous Oscillations, IEEE Trans. Vol. PAS-99, No. 5, 1980, p.1810.


[3] Chong yie, He yanzong, Wang zheng, Li fang ze: Rotor dynamics (Tsinghua University press, 1987).

[4] Wang Qi: Torsional vibration of Gas engine shaft system (Dalian University of Technology Press. 1991).

[5] Wang Zheng, Li Ping: Journal of Tsinghua University (Science and Technology). Vol. 35 (1995).

[6] Wang maocheng: Finite element method (Tsinghua University Press. 2003).

[7] ANSYS Corp. ANSYS Structural Analysis Guide, (2005).

[8] J.M. Barsom ad S.T. Rolfe, Fracture and fatigue control in structures : applications of fracture mechanics. 3rd edition, Woburn, MA : Butterworth-Heinemann ; West Conshohocken, PA : ASTM, c1999.


Fetching data from Crossref.
This may take some time to load.